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Safety
Important Regulatory and Installation Requirements
IMPORTANT
When replacing parts, use original
Viessmann or Viessmann approved
replacement parts.
For coaxial venting systems only:
Venting material to be supplied by
Viessmann only.
The venting system must be installed
by a licensed professional heating
contractor familiar with the operation
and maintenance of heating appliances
and venting. Before installing this
product, ensure that the complete
installation literature has been read.
Failure to follow proper installation
procedures as stated in these
instructions, including vent pitch and
proper appliance connections, may
violate local, provincial/state, or
national codes and cause unsafe
conditions which may lead to severe
property damage or personal injury.
The venting system must be installed
in accordance with local building code
requirements as well as national codes.
For installations in Canada use
CAN/CSA-B149.1 Natural Gas
Installation Code or CAN/CSA-B149.2
Propane Installation Code as applicable;
in the U.S. use the National Fuel Gas
Code ANSI Z223.1 or NFPA Standard
54.
To ensure safe operation of the
appliance, Viessmann recommends that
the system be inspected once a year
by a qualified service technician.
Every venting system must be planned
and installed for optimum performance
and safety. These Installation
Instructions are designed to help you
determine venting requirements and
limitations with respect to installation.
Please read and follow these
instructions carefully.
It is the responsibility of the installer to
contact local building and fire officials
concerning any installation restrictions
and/or inspection requirements that
may apply. Permits may be required
before commencement of the
installation.
8
The vent termination for side wall vent
installations should be located on a
wall that is least affected by prevailing
winds. High winds may affect boiler
operation and/or degrade the exterior
finish of the wall. They may also cause
recirculation of the appliance's own
flue products. Recirculation of flue
products can result in poor combustion
and inlet condensation problems. If
wind is a problem, steps must be taken
to shield the vent termination from high
winds, such as building a fence or
planting shrubs. Ensure that the total
equivalent vent length is not exceeded.
Operation with balanced flue using
Viessmann supplied coaxial vent
system
IMPORTANT
Side wall vent installations must
include Viessmann protective screen.
Because of its sealed combustion
chamber, the Vitodens gas-fired
condensing boiler is suitable for
operation with balanced flue.
The Vitodens and the coaxial vent-air
intake system are approved together
under CSA 4.9. ANSI Z21.13 - 2005
Standard.
The vent length requirements stated in
this manual (starting on page 21 for
side wall vent installations and page 31
for vertical vent installations) must be
observed.
The combustion air is supplied and the
flue gas discharged via a coaxial double
pipe. Combustion air is fed through the
circular gap between the outer
aluminum air intake pipe and the vent
pipe. Flue gases are discharged via an
inner pipe constructed from
flame-retardant plastic (polypropylene
rated for a maximum temperature of
250ºF / 121ºC).
(continued)
ot all inspection authorities require a
N
leak test of the vent-air intake system
in conjunction with the wall-mounted
gas-fired boiler during system start-up.
In cases where the leak test is not
required, Viessmann recommends that
the heating contractor perform a
simplified leak test when starting up
the system. For this purpose, it is
sufficient to measure the CO
concentration in the combustion air of
the circular gap of the coaxial vent-air
intake pipe. The vent pipe is considered
sufficiently leak-proof if the CO
concentration in the combustion air is
no higher than 0.2 % and the O
concentration no lower than 20.6 %.
If higher CO
or lower O
2
measured, the flue gas system must be
checked for leaks.
The coaxial venting material can be
extended (without exceeding the
maximum equivalent length) beyond
the outside wall of the structure,
provided that the coaxial venting
material is installed in an enclosed,
insulated and waterproof chase that is
acceptable for outdoor installation. The
vent termination location must comply
with the instructions and codes stated
in this manual.
IMPORTANT
Potential gaps between the vent-air
intake and the surrounding construction
which may cause air, rain or flue gases
to leak into the wall or the building,
must be sealed with approved
sealant/caulking to prevent leakage of
any kind.
2
2
2
values are
2
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